The EazypowerFlexABit, FlexABit Plus and FlexAWrench tools all flex to a 90-degree angle. These flexible tool extensions do not permit the outer surface to rotate. The FlexABit can be used at any speed and has been rated 3.5 ft/lbs of torque, while the FlexABit Plus can be used with heavy duty drills and has been rated 13 ft/lbs of torque. The FlexAWrench can be used for drive sockets and 3/8" drive sockets. They can be used with most screwdriver tips.